I noticed one thing you didn't mention concerning no air flow from the hose on an air compressor. There could be frozen water in the hose if it is in an unheated garage even if you drain the tank every time you get done using it moisture can collect in the hose and freeze. I had it happen to me!
I would like to instal a second head to my shop compressor and would like to know how to do this exactly
_______________________ Bill says...
I guess you want to add the second pump head to try and increase flow capacity?
Even if I had done it, I wouldn't even know where to begin to advise you how, as you have provided no information about your existing compressor.
It were me trying to add capacity, I wouldn't fool with the very complex process of trying to convert a single head compressor into a two pump-headed one. I would instead install another compressor to augment the existing one.
Information on how to do that is covered in a number of places on this website. Read on!